Paper roll



C. DAVIS PAPER ROLL Filed Sept. 9, 1938 May 7, l 940.

INVENTOR 55 0A v/s ATTORNEY 55 9 22 z@ 5 L m O k v q l lzov 7 m 2 22 2 a a 4 a J 6 May 7, 1940. c. DAVIS 2.200.160

PAPER ROLL Filed Sept. 9, 1938 2 Sheets-Sheet 2 INVENTOR a? 67/4 24 5 0/! l/AS' Z2 7 BY ".7-

ATTORNEY Patented May 7, 1940 UNITED STATES.

PATENT OFFICE PAPER ROLL Charles Davis, Piedmont, W. Va., assignor to West Virginia Pulp and Paper Company, New York, N. Y., a corporation of Delaware Application September 9, 1938, Serial No. 229,086

1 Claim.

of the Fourdrinier machine, minute irregularities in thickness exist having a direction parallel to the direction of travel of the web. It is the experience of paper manufacturers that owing to the directional quality of these irregularities parallel to the length of the web, such irregularities, when the paper is wound upon a roll, exert a cumulative effect which frequently attains such proportions as to distort or stretch the paper and render the rolls unsatisfactory for various uses including web printing presses. In order to prevent this it is the practice to wind the rolls looser than is to be desired; and as a result of this it not infrequently happens that the layers of the roll slide on 'one another during handling or shipment, a matter which is disadvantageous and results in injury to the paper, When the paper is coated such irregularities are accentuated. Furthermore, additional longitudinal ridges are frequently added in the calendering of coated papers, with the result that it is difficult to produce rolls of coated paper suitable for web printing.

My invention is predicated upon the discovery that the above mentioned defects may be entirely eliminated and a smooth, tightly wound roll had by oscillating the paper during the winding operation slightly in its own plane and transversely of its direction of travel, thereby preventing the irregularities in width from building up in the roll. According to one way of making the improved product the paper, after leaving the coating or paper makingv machine (which latter may be of any known type as Fourdrinier, Yankee, etc.) in the form of a roll, is rewound, in which case the roll to beunwound is given a movement of oscillation along the axis of the roll, the web passed between a pair of trimmers of a fixed distance apart, whereupon the web so trimmed is wound into the final roll, the trimmers being located at a distance from the adjacent edges which is slightly greater than the amount of the oscillation. Alternatively, the web may be received on an oscillating winding roll in the machine and the unevenness produced on the ends of the rolls removed in the rewinding and trimming operations. In the drawings: Fig. 1 is a plan view of one end of the paper roll and its shaft together with a bearing for said shaft adapted for oscillation and embodying .a preferred form of the invention;

Fig. 2 is a view in vertical sectional elevation taken on the broken line 22 of Fig. 1;

Fig. 3 is a view in vertical section taken on 5 the line 3-3 of Fig. 1;

Fig. 4 is a view in perspective, schematic in character, showing an arrangement of the unwinding and winding rolls and of the trimmers for the web disposed between said rolls.

In a preferred embodiment of the invention, the reference character ll designates a web of coated paper which is being unwound from a roll R thereof mounted upon a shaft I 2 which extends into and is supported at one end by 'a 5 hearing i3, collars l4 and Ma being secured by set-screws upon the shaft l2 for the purpose of locating the roll R of the paper with respect to the finished roll R The roll is held upon the shaft in the usual manner by means of a sleeve 20 ii at each end.

Bearing I3 is carried by or is integral with block l6 which is adapted to permit a limited adjustment of the bearing I3 transversely of the shaft l2. To accomplish this, block l6 slides in a dovetail groove Isa. in head H, as best shown in Fig. 3. To produce this motion a spindle 2| having threaded engagement with the block I6 is mounted in lugs 22-23 of the head I'l, so that by turning the screw nut 25 the bearing l3 will 30 be moved transversely of the axis of the roll. Provision is also had for adjusting the roll in an axial direction, and this is accomplished by mounting the head I! in a dovetail guide I8 and causing it to have an adjusted position by means of the spindle 21 having threaded engagement with a lug 29 of said head l1, said spindle being journaled in lugs 28 of a carriage [9 so that this adjustment is accomplished by turning the knurled nut 26.

The arrangement provided for oscillating the shaft in a longitudinal direction will now be described, it being understood that such meansvis illustrative merely and that various other mechanical devices might be employed for accomplishing the same purpose. A shaft 30 is mounted in bearings 3| carried by rails 20 between which an eccentric 32, fixed on the shaft 30, turns in a yoke 33 which depends from the carriage IS, the operative relationship of the eccen- 5o tric 32 and yoke 33 being best seen in Fig; 3, from which it is evident that the continuous rotation of the eccentric 32 causes the carriage i9 and the parts carried thereby to oscillate in a riage I9 is held against upward displacement from the rails 20 by means of the gib plates I91: engaging the under side of said rails.

A preferred means of actuating the shaft 30 comprises an electric motor of constant speed type which drives said shaft through a speed reduction box 38, a shaft 36 in alignment with shaft 30 and a flexible coupling 31 joining said shafts, the motor and speed reduction boxbeing secured to the base B of the apparatus by means of bolts 40.

' As shown in Fig. 4 the web W leaving the oscillating roll R. passes over idlers l l and thence to rotary cutters 42-43 which operate against supporting rolls 4445 andare driven by means not shown. The portions of the roll so trimmed off are indicated at 48, 49. The cutters 4243 are disposed at a fixed distance apart and also from the adjacent edges of the web by an amount slightly greater than the amount of the oscillation whereby the oscillation of the web in its own plane causes the thickness of the trim to vary by the amount of such oscillation, producing a trimmed sheet of fixed width, which sheet is then wound onto the roll R by means of the driven rolls 50, 5| supporting said roll R In this manner the roll R may be tightly wound and because of the now stepped relation of the minute irregularities in thickness of the sheet, the roll presents a smooth appearance free of welts and ridges and the ends thereof are of likewise smooth appearance.

The amount of the oscillation and the frequency thereof will vary with the different grades of paper and other factors, but in general I have found a movement of oscillation of approximately /2 inch to 2 inches every 90 seconds to be satisfactory for most work for the usual rewinding speeds.

It will be evident from the foregoing that my improved roll of paper, which may be of any size suitable for use in printing presses, is characterized by the fact that the contiguous layers are staggered with respect to one another in an axial direction; further, that lines parallel to the longitudinal median line of the paper as manufactured assume a curve of generally sinusoidal shape the amplitude of which is minute in relation'to the length of the roll.

This application is a continuation in part of my copending application Serial No; 113,583 filed December 1, 1936, now Patent 2,130,332 of September 13, 1938, in which claims are made to the apparatus and process herein disclosed.

I claim:

A roll of coated paper having minute longitudinally extending irregularities in thickness or ridges characteristic of paper made in a continuous web, said roll having smooth ends substantially perpendicular to the roll axis and being tightly wound to prevent sliding of layers one over the other and of a size suitable for use in printing presses, said minute longitudinally extending irregularities in thickness or ridges in said roll extending along a uniform sinusoidal path and the corresponding ridges in adjacent layers being in offset or staggered relation to each other whereby such irregularities are to a substantial degree not directly superimposed so that distortion and stretching of the paper are avoided.

CHARLES DAVIS. 

